Move JSCRuntime into its own folder (#35482)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/35482

This change moves the JSCRuntime.h/cpp into a `jsc` folder.

This change is required for several reasons:
1. on iOS, the new `jsi`, `jsidynamic` and `jsc` setup is breaking the `use_frameworks!` with  `:linkage => :static` option with the old architecture. So it is a regression.
2. JSCRuntime is required by some libraries and needs to be exposed as a prefab and the current setup makes it hard to achieve.

allow-large-files

## Changelog:
[General][Changed] - Move JSCRuntime into a separate pod/prefab

Reviewed By: cortinico

Differential Revision: D41533778

fbshipit-source-id: 642240c93a6c124280430d4f196049cb67cb130b

ReactCommon/jsc/.clang-tidy

@@ -0,0 +1,6 @@
+---
+Checks: '>
+clang-diagnostic-*,
+'
+InheritParentConfig: true
+...

ReactCommon/jsc/BUCK

@@ -0,0 +1,34 @@
+load("//tools/build_defs/oss:rn_defs.bzl", "APPLE", "IOS", "MACOSX", "get_apple_compiler_flags", "get_apple_inspector_flags", "get_preprocessor_flags_for_build_mode", "react_native_xplat_dep", "rn_xplat_cxx_library")
+
+APPLE_COMPILER_FLAGS = get_apple_compiler_flags()
+
+rn_xplat_cxx_library(
+    name = "JSCRuntime",
+    srcs = [
+        "JSCRuntime.cpp",
+    ],
+    header_namespace = "jsc",
+    exported_headers = [
+        "JSCRuntime.h",
+    ],
+    apple_sdks = (IOS, MACOSX),
+    compiler_flags_pedantic = True,
+    fbobjc_compiler_flags = APPLE_COMPILER_FLAGS + [
+        "-Os",
+    ],
+    fbobjc_frameworks = [
+        "$SDKROOT/System/Library/Frameworks/JavaScriptCore.framework",
+    ],
+    fbobjc_preprocessor_flags = get_preprocessor_flags_for_build_mode() + get_apple_inspector_flags(),
+    labels = [
+        "pfh:ReactNative_CommonInfrastructurePlaceholder",
+    ],
+    platforms = APPLE,
+    visibility = ["PUBLIC"],
+    xplat_mangled_args = {
+        "soname": "libjscjsi.$(ext)",
+    },
+    exported_deps = [
+        react_native_xplat_dep("jsi:jsi"),
+    ],
+)

ReactCommon/jsc/CMakeLists.txt

@@ -0,0 +1,30 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+##################
+### jscruntime ###
+##################
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+add_compile_options(
+        -fexceptions
+        -frtti
+        -O3
+        -Wno-unused-lambda-capture
+        -DLOG_TAG=\"ReactNative\")
+
+add_library(jscruntime STATIC
+        JSCRuntime.h
+        JSCRuntime.cpp)
+
+target_include_directories(jscruntime PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(jscruntime folly_runtime jsc glog)
+
+# TODO: Remove this flag when ready.
+# Android has this enabled by default, but the flag is still needed for iOS.
+target_compile_options(jscruntime PRIVATE -DRN_FABRIC_ENABLED)

ReactCommon/jsc/React-jsc.podspec

@@ -28,12 +28,8 @@ Pod::Spec.new do |s|
   s.source_files           = "JSCRuntime.{cpp,h}"
   s.exclude_files          = "**/test/*"
   s.framework              = "JavaScriptCore"
-  s.dependency "React-jsi", version
-  s.default_subspec        = "Default"
 
-  s.subspec "Default" do
-    # no-op
-  end
+  s.dependency "React-jsi", version
 
   s.subspec "Fabric" do |ss|
     ss.pod_target_xcconfig  = { "OTHER_CFLAGS" => "$(inherited) -DRN_FABRIC_ENABLED" }

ReactCommon/jsi/BUCK

@@ -1,4 +1,4 @@
-load("//tools/build_defs/oss:rn_defs.bzl", "APPLE", "IOS", "MACOSX", "react_native_xplat_dep", "rn_xplat_cxx_library")
+load("//tools/build_defs/oss:rn_defs.bzl", "react_native_xplat_dep", "rn_xplat_cxx_library")
 
 rn_xplat_cxx_library(
     name = "jsi",
@@ -56,33 +56,3 @@ rn_xplat_cxx_library(
         react_native_xplat_dep("jsi:jsi"),
     ],
 )
-
-rn_xplat_cxx_library(
-    name = "JSCRuntime",
-    srcs = [
-        "JSCRuntime.cpp",
-    ],
-    header_namespace = "jsi",
-    exported_headers = [
-        "JSCRuntime.h",
-    ],
-    apple_sdks = (IOS, MACOSX),
-    compiler_flags_pedantic = True,
-    fbobjc_compiler_flags = [
-        "-Os",
-    ],
-    fbobjc_frameworks = [
-        "$SDKROOT/System/Library/Frameworks/JavaScriptCore.framework",
-    ],
-    labels = [
-        "pfh:ReactNative_CommonInfrastructurePlaceholder",
-    ],
-    platforms = APPLE,
-    visibility = ["PUBLIC"],
-    xplat_mangled_args = {
-        "soname": "libjscjsi.$(ext)",
-    },
-    exported_deps = [
-        react_native_xplat_dep("jsi:jsi"),
-    ],
-)